Module 04 Part 4

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3b. Servomechanisms.

Ques Questi tion on Num Number. er. 1. When hen a serv servom omot oto or ov oversh ershoo oots ts afte afterr a step step inp input and and osc oscil illa late tess it is. Option A. under damped. Option B. over damped. Option C. C. critically da damped. Corr Correc ectt Answe nswerr is. is. under nder dam damped ped. Epla plana nati tion on.. N!" N!".

Ques Questi tion on Num Number. er. #. A redu reduct ctio ion n fro from m th the op optim timum sett settin in$ $ of of the the veloc elocit ity y fee feedb dbac ac%  %  in a servo loop could cause. Option A. instability. Option B. slow response. Option C. ow servo $ain. Corr Correc ectt Answe nswerr is. is. inst instab abil ilit ity y. Eplana Eplanatio tion. n. &ee 'alle 'allett tt Auto Automat matic ic (li$ht (li$ht Contr Control ol p$ )). )).

Question Number. *. +he phase difference between the supplies of a two pha phase induction motor is. Option A. ,-. Option B. 1)-. Option C. -. Correct Answer is. ,-. Eplana Eplanatio tion. n. +he phase phase differen difference ce of the two phases phases applied applied to an inductio induction n motor motor is ,-. ,-.

Question Number. /. !f the the rot rotor of th the rec receiver in a tor tor0ue syn synchro sys system was was  prevented from ali$nin$ with the transmitter rotor then. Opti Option on A. the the tran transm smitt itter er rot rotor or wil willl turn turn to ali$n ali$n with with the the receiv receiver er rot rotor or.. Option B. the re receiver will hunt. Option C. the re recei ceiver will overh erheat. at. Corr Correc ectt Ans Answe werr is. is. the the rece receiv iver er wil willl over overhe heat at.. Eplanation Eplanation.. Current Current flows in the stator whenev whenever er the rotors rotors are are not in in correspon correspondence. dence.

Question Number. 2. An E3! bar output at datum has. Opti Option on A. an imb imbal alan ance ce of of volt volta$ a$es es in in the the seco second ndar ary y wind windin in$s $s.. Opti Option on B. no indu induce ced d vol volta ta$e $e in the the sec secon onda dary ry wind windin in$s $s.. Opti Option on C. e0ual e0ual and and oppo opposit sitee vol volta$ ta$es es indu induce ced d in in the the seco second ndary ary.. Correct Correct Answe Answerr is. e0ual e0ual and and oppos opposite ite volta$e volta$ess induc induced ed in in the the secon secondary dary.. Eplana Eplanatio tion. n. &ee 'allett 'allett Auto Automat matic ic (li$ht (li$ht Contro Controll p$ 1*-. 1*-.

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www.easaquestionpapers.blogspot.com Ques Questi tion on Num Number. er. 4. +he res resul ultt of of cro cross ss con connect nectin in$ $ two two of th the tra trans nsm missi issio on lea lead ds in in a tor0ue synchro system and then turnin$ the rotor of the transmitter 4- cloc%wise would be. Opti Option on A. the the rece receiv iver er woul would d mo move 4- 4- clo cloc% c%w wise. ise. Opti Option on B. the the rec recei eive verr wou would ld move move 4- 4- ant antic iclo loc% c%wi wise se.. Opti Option on C. the the rec recei eive verr wou would ld move move 1#- 1#- anti anticl cloc oc%w %wis ise. e. Corre Correct ct Ans Answe werr is. the the receiv receiver er woul would d move move 4- 4- anticl anticloc oc%w %wis ise. e. Epla plana nati tion on.. N!" N!".

Quest estion Number. er. 5. +he con control win windin$s of a tw two ph phase se servomotor is su supplied with AC volta$e of. Opti Option on A. varia ariab ble am amplit plitu ude var varia iab ble ph phase. ase. Option B. variable phase. Option C. constant amplitude. Corre Correct ct Answe nswerr is. varia variabl blee ampl amplit itud ude e vari variab able le pha phase. se. Eplana Eplanatio tion. n. +he contro controll windin windin$s $s are fed with variable variable amplitu amplitude de AC but the amplitu amplitude de can be positive 6in phase7 or ne$ative 6anti8phase7.

Question Number. ). !f the ro rotor of a control syn synchro stic%s. Option A. the system hunts. Opti Option on B. the the pos posit itio ion n fee feedb dbac ac% % wil willl osc oscil illa late te.. Option C. C. hi$h cu current wi will fl flow. Corr Correc ectt Ans Answe werr is. is. hi$h hi$h curr curren entt wil willl flo flow w. Eplan lanation. 9i$h current flo flows in the sta stators whenever the rot rotors are not in correspondence.

Question Number. ,. With the reversal of the connections to the rotor of the transmitter of a tor0ue synchro the position of the receiver rotor will be. Option A. chan$ed by by 1#-. Option B. unchan$ed. Option C. chan$ed by 1)-. Corr Correc ectt Ans Answe werr is. is. chan chan$e $ed d by by 1) 1)-. -. Epla plana nati tion on.. N!" N!".

Quest estion Number. er. 1-. +he applicat cation of a :st :stic%8of 8off: volta$e a$e to a control syn synchro servo system is. Opti Option on A. to over overco come me the the eff effec ectt of stat static ic fric fricti tion on.. Opti Option on B. to over overco come me the the eff effec ectt of visc viscou ouss fri frict ctio ion. n. Opti Option on C. to prev revent ent ali ali$n $nm ment ent to to a fals falsee nul null. l. Corre Correct ct Answe nswerr is. is. to prev preven entt ali$ ali$nm nmen entt to a false false null. null. Eplana Eplanatio tion. n. &tic%8o &tic%8off ff volta$ volta$ee is to prevent prevent ali$nment ali$nment to a false false null 6i.e. 6i.e. 1)- de$rees de$rees out7 when system is switched off.

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www.easaquestionpapers.blogspot.com Ques Questi tion on Num Number. er. 11. A serv servo o sy system stem may in includ cludee a bra bra% %e an an au automa tomati ticc tri trim m sy system stem is one eample where a bra%e is used. +he bra%e is. Opti Option on A. appli applied ed when when trim trimmi min$ n$ is com compl plet etee to prev preven entt stab stabili ili;er ;er creep creep.. Option Option B. applied applied durin$ durin$ trimmin trimmin$ $ to preven preventt oscil oscillati lations ons about about the demand demand positio position. n. Opti Option on C. C. appl applie ied d dur durin in$ $ trim trimmi min$ n$ to to prev preven entt serv servo o runa runawa way y. Correct Correct Answe Answerr is. applied applied when when trimmi trimmin$ n$ is is complet completee to prev prevent ent stab stabili; ili;er er creep. creep. Eplana Eplanatio tion. n. +he trim trim switch switch often often consists consists of # separate separate switch switches. es. One One is to release the the  bra%e the other is to switch on the motor. motor.

Ques Questi tion on Num Number. er. 1#. !n a cont contro roll sync synch hro the the stat stato or curr curren entt cea cease sess to to flo flow w whe when. n. Option A. the C+ C+ rotor is at at null. Option B. when power is removed. Opti Option on C. when when the the two two roto rotors rs are are ali$ ali$ne ned d. Corr Correc ectt Answe nswerr is. is. when when powe powerr is is rem remov oved ed.. Eplana Eplanatio tion. n. !n a contro controll synchro synchro the stator stator is supplied supplied with with current current at all times times whateve whatever  r  the transformer rotor position.

Ques Questi tion on Numb Number er.. 1*. 1*. +he +he res resul ultt of of rev rever ersi sin$ n$ the the rot rotor or conn connec ecti tion onss to to the the rece receiv iver er of a tor0ue synchro system is that the rotor position. Option A. is chan$ed by 1)-. Option B. is unchan$ed. Option C. is chan$ed by 1#-. Corr Correc ectt Answe nswerr is. is. is chan chan$e $ed d by 1)- 1)-.. Epla plana nati tion on.. N!" N!".

Ques Questi tion on Num Number. er. 1/. A two two pha phase se indu induct ctio ion n mot motor or used sed in in a serv servo omech mechan anis ism. m. Option A. A. will al always ays re re0uire a st starter ter. Option B. runs with no slip. Opti Option on C. is self self star starti tin n$ unde underr li$ li$ht ht load loads. s. Corre Correct ct Answe nswerr is. is. is self self start startin in$ $ und under er li$ li$ht ht load loads. s. Epla plana nati tion on.. N!" N!".

Ques Questi tion on Num Number. er.

12.

A hy hyster steres esis is ser serv vo mot moto or is use used d in a ser serv vomec omecha hani nism sm bec becau ause se..

Opti Option on A. it has has $o $ood star starti tin n$ cha chara ract cter eris isti tics cs.. Opti Option on B. $ood ood sp speed eedust. Option A. lever le len$th. Option B. B. lever an an$le an and le lever len$th. Option C. lever an$le. Corr Correc ectt Answe nswerr is. is. leve leverr an$ an$le. le. Epla plana nati tion on.. N!" N!".

Ques Questi tion on Num Number. er. 25. +or0ue r0ue syn synchro chro rece receiv iver er beari earin$ n$ fric fricti tion on will will cau cause. se. Option A. improved accuracy. cy. Option B. misali$nment. Option C. huntin$. Share your documents with us at ([email protected] ( [email protected])) DownloadOur Mobile pp !or "ecent #apers

www.easaquestionpapers.blogspot.com Corr Correc ectt Ans Answe werr is. is. misal isali$ i$nm nmen ent. t. Epl Eplan anat atio ion. n. Beari Bearin$ n$ fricti friction on will caus causee the the deli delicat catee roto rotorr to stop stop before before the the desi desired red  position.

Quest estion Number. er. 2). A control syn synchro chro syst systeem pointer is. Opti Option on A. actu actuat ated ed by a perm perman anen entt ma$ne a$net. t. Opti Option on B. disp isplace laced d by by the the tor0 tor0u ue of of the the stat stator or.. Option C. motor dr driven. Corr Correc ectt Answe nswerr is. is. moto otor dri driv ven. en. Eplana Eplanatio tion. n. +he receive receiverr of a control control synchro synchro is effecti effectively vely a slow speed speed synchron synchronous ous motor.

Ques Questi tion on Num Number. er. 2,. A @.C @.C. si$ si$n nal conv conver erte ted d to to a phas phasee sen sensi siti tive ve A.C. .C. is. is. Option A. modulation. Option B. demodulation. Option C. phase conversion. Corr Correc ectt Answe nswerr is. is. modul odulat atio ion n. Eplana Eplanatio tion. n. @C to phas phasee sensiti sensitive ve AC AC  :modulat :modulation ion:.:.

Question Number. 4-. +he ro rotor coil of a synchrotel. Opti Option on A. rota rotate tess onl only y wh when a cu curren rrentt flo flows ws in it. it. Option B. rotates. Option C. is stationary. Corr Correc ectt Ans Answe werr is. is. is stat statio ion nary ary. Epla plana nati tion on.. N!" N!".

Quest estion Number. er. 41. +he purpo rpose of syn synchr chro capacito itors in a differen rential ial syn synchro transmission system. Opti Option on A. redu reduce ce stat stato or cir circu cuit it impe impeda danc nce. e. Option B. to reduce sta stator curren rent. Option C. reduce rotor current. Corr Correc ectt Ans Answe werr is. is. to redu reduce ce sta stato torr curr curren ent. t. Eplana Eplanatio tion. n. &ynch &ynchro ro capacito capacitors rs reduce stator stator current current and ma%e the synchro synchro system system more accurate.

Ques Questi tion on Num Number. er.

4#.

+he purp purpos osee of a fly flywh whee eell in a sy synchro chro rec recei eive verr ind indicat icator or is is to. to.

Option A. increa rease drivin$ tor0u r0ue. Opti Option on B. prev revent ent spin spinn nin$ in$ or osc oscil illa lati tion on.. Option C. encoura$e spinnin$. Corre Correct ct Answe nswerr is. is. prev preven entt spin spinni nin$ n$ or oscil oscillat latio ion. n. Epl Eplan anat atio ion. n. +he +he flywh flywhee eell is coup coupled led to some some form of bra% bra%ee 6e.$. 6e.$. ma$neti ma$netic7 c7 to reduce reduce oscillations.

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www.easaquestionpapers.blogspot.com Question Number. 4*. A linear variometer is. Opti Option on A. a speci special al sy synchr nchro o $iv $ivin in$ $ ac outp output ut prop propor ortio tiona nall to shaf shaftt an$l an$le. e. Opti Option on B. a spe specia ciall auto auto trans transfo form rmer er for for sync synchr hro o syst system em powe powerr supp suppli lies. es. Opti Option on C. an alte altern rnat ativ ivee ter term m fo for a des desy ynn syst system em.. Correct Correct Answe Answerr is. a special special synchr synchro o $ivin $ivin$ $ ac outp output ut prop proporti ortiona onall to shaf shaftt an$le. an$le. Epl Eplan anat atio ion. n. A line linear ar vari variom omet eter er is a devi device ce whic which h $ive $ivess an outp output ut volt volta$ a$ee dire direct ctly ly  proportional to an$le when coupled to a $yro 6for eample7.

Quest estion Number. er. 4/. !n a sy synchrotel the ro rotatin tin$ wi windin$ is is. Option A. the st stator. Option B. rotor. Option C. neither. Correct rect Answer is. is. neith ither. er. Epl Eplan anat atio ion. n. +his +his is a tric% tric% 0uest 0uestio ion n becau because se a synch synchro rotel tel has NO rota rotati tin$ n$ wind windin in$. $. Aircraft !nstruments and !nte$rated &ystems 'allett 'a$e 1/,or >ority Carrie rrierr mat mateerial rial.. Opti Option on B. B. +he +he dono donorr to an N8+ N8+y ype sem semi8 i8co cond nduc ucto torr mate materi rial al.. Opti Option on C. C. +he +he acce accept ptor or to to a '8+ '8+y ype sem semi8 i8co cond nduc ucto torr mate materi rial al.. Correct Correct Answe Answerr is. +he +he accept acceptor or to a '8+y '8+ype semi semi8co 8condu nducto ctorr mater material ial.. Epla plana nati tion on.. N!" N!".

Question Number. 2. a microprocessor on a 'CB. Opti Option on A. is not not eas easil ily y dam dama$ a$ed ed by stat static ic8e 8ele lect ctri rici city ty.. Opti Option on B. is easil easily y dama dama$e $ed d by by static static8e 8elec lectri trici city ty if mish mishan andl dlin in$. $. Opti Option on C. C. is onl only y easil easily y dam dama$ a$ed ed by by stat static ic8el 8elect ectri ricit city y if rem remov oved ed fro from m teh teh 'CB. 'CB. Correct Correct Answe Answerr is. is easil easily y dama dama$ed $ed by static8 static8elec electric tricity ity if mish mishand andlin lin$. $. Epla plana nati tion on.. N!" N!".

Quest estion Nu Number. er. 4. On a tor0ue sy synchr chro th the AC po power su supply is ap applie lied to to. Opti Option on A. the the roto rotors rs of of both both the the tran transm smit itte terr and and the the rece receiv iver er.. Opti Option on B. the the rot roto or of of th the tra trans nsmi mitt tter er only only.. Opti Option on C. C. the the stat stator orss of both both the the tra trans nsmi mitt tter er and and the the rece receiv iver er.. Correct Correct Answe Answerr is. the rotors rotors of both both the the tran transmi smitter tter and the receive receiver. r. Epla plana nati tion on.. N!" N!".

Quest estion Number. er.

5.

+he Cha Characte cteris ristic Cu Curve of a tr transisto stor is pl plotte tted on a ais of. of.

Option A. base current a$ain ainst ?ec. Opti Option on B. coll collec ecto torr curr curren entt a$ai a$ain nst ?be. Opti Option on C. coll collec ecto torr curr curren entt a$ai a$ain nst ?ec. Corre Correct ct Answe nswerr is. is. colle collecto ctorr curre current nt a$a a$ain inst st ?e ?ec. Eplan lanation. N!". http